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DHT22 and PCF8575

This topic has 3 replies, 2 voices, and was last updated 2 years, 7 months ago by Renzo Mischianti.

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- 11 May 2022 at 05:30 #20786
  deryt
  Participant
  Hello. On pin P1 I attach the DAT from the sensor DHT22
  How do I get the temperature?
- 11 May 2022 at 08:01 #20787
  Renzo Mischianti
  Keymaster
  Hi deryt,
  you must follow the datasheet for communication protocol.
  And add an interrupt to the pcf8575 to retrieve all data.
  
  Bye Renzo
- 11 May 2022 at 09:07 #20788
  deryt
  Participant
  I connected directly to the nodemcu, but I can’t connect to the PCF8575 port expander
- 11 May 2022 at 10:17 #20789
  Renzo Mischianti
  Keymaster
  Hi deryl,
  you can follow 2 ways to put in work (and there is a risk that pcf8575 is too slow for the DHT22).
  You rewrite the DHT library to use pcf8575 or you implement the DHT22 communication protocol over pcf8575.
  Bye Renzo
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